Viscous coupling

摘要

A viscous coupling has a casing having a fluid chamber defined therein, and a plurality of first plates and a plurality of second plates, the first and second plates being rotatable about a common axis and disposed in the fluid chamber. The first and second plates drivingly interconnect the casing and at leest one rotatable member. A viscous fluid introduced into the fluid chamber through an inlet port defined in one end wall of the casing flows circumferentially in and along an annular groove defined in an inner surface of the end wall. Each of the first and second plates has a plurality of holes defined therein and spaced circumferentially thereof. The viscous fluid flows through these holes into spaces between adjacent ones of the first and second plates. The other end wall of the casing has an air vent hole defined therein which allows air to escape from the fluid chamber when the viscous fluid is charged into the fluid chamber.